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Table 1 ABO phenotype by placental malaria category and parity group

From: ABO blood group system and placental malaria in an area of unstable malaria transmission in eastern Sudan

Parity Placental malaria Blood group Phenotype
  Type number A B AB O
Total Acute 6 5 (6.1) 1(1.7) 0 (0) 0 (0)
  Chronic 6 2(2.4) 1(1.7) 1(4.2) 2(1.6)
  Past 82 19(23.2) 13(22.0) 5(20.8) 45(35.2)*
  None 199 56 (68.3) 44(74.6) 18(75) 81(63.3)
  Total 293 82 59 24 128
Primiparae Acute 2 2(6.5) 0(0) 0(0) 0(0)
  Chronic 1 0(0) 0(0) 1(12.5) 0(0)
  Past 26 5(16.1) 3(12.5) 2 (25.0) 16(31.4)*
  None 85 24(77.4) 21(87.5) 5(62.5) 35(68.6)
  Total 114 31 24 8 51
Secundiparae Acute 2 1(4.2) 1(12.5) 0(0) 0(0)
  Chronic 0 0(0) 0(0) 0(0) 0(0)
  Past 18 8(33.3) 0(0) 0(0) 10(38.5)
  None 41 15(62.5) 7(87.5) 3(100) 16(61.5)
  Total 61 24 8 3 26
Multiparae Acute 2 2(7.4) 0 0 0
  Chronic 5 2(7.4) 1(3.7) 0 2(3.9)
  Past 38 6(22.2) 10(37) 3(23.1) 19(37.3)
  None 73 17(63.0) 16(59.3) 10(76.9) 30(58.8)
  Total 118 27 27 13 51
  1. * Significant difference